Safety filling-trap.



C. L. FRENCH.

SAFETY FILLING TRAP.

APPLICATION F1LED1uLY14.1913.

1,169,771. Patented 11.1.1, 1916.

CHLRLES Ll FRENCH, Ol? CAMBRIDGE, MASSAGH'USETTS.

SAFETY FILLING-TRAP.

linearer.

Specification of Letters Patent.

Patented Feb. 1l, Mild.

Application filed July lll, 1913. Serial llo. 779.9%.

n To all 'whom it may concern."

Be it known that il, CHARLES L. FRENCH, of Cambridge, in the county of Middlesex and State of Massachusetts, have invented certain neiv and useful improvements in Safety Filling-Traps, or' which the following is a specilication.

This invention 'relates to automatic safety appliances for filling traps such as are used in connection with underground tanks inl which is Y,stored gasolene, naphtlia, or the like, and is designed to prevent overiilling or overflowing oi the fluid, incases of neglect or carelessness on the part of the attendant.

s at present constructed, these traps are provided with a screw cap which is supposed to be in place except when the actual operation of gaging the depth of liquid is taking'.

place; but, as this safeguard depends mainly uponI the care and attention of the operative, li deem. it necessary to provide anxiliary means for automatically preventing overow, suoli as will not, 1n any Way,

interfere with the legitimate uses of the trap.

as a Whole.

ln the accompanyin g drawings, which form part ot this specification and in which l have illustrated one form of my invention, Figure 1 is a vertical, central section of a filling trap equipped with my invention.

2 2 of Fig. 1. Fig. 3 is a plan section on line 3--3 ot' Fig. 1.

The box or frame 1 has, at the top, a

i threadedl socket 2 adapted to receive the plug 3, which is seated against a packing Washer 4l on the shelf 5.' lBelov.T plug 3,

box 1-incloses a chamber 6 containing a threaded nipple 7, integral with theflioor 8 oit chamber 6, which nipple is fitted With a screw cap 9 adapted to seat against a washer 10 on nipple 7. f W,

' rlfhe central opening 11 of nipple 7 extends through the door S and is terminated in a'.

valve-seat 12 at its lower end. Valve-seat ,l2

. is formed Within a second chamber 13 which is adapted to house and completely inclose a weighted valve 1l, pivotally mounted Within chamber 13 at 15. .A Weight 16, integrally.

connected with valve il, is so disposed as to allow gravity to automatically maintain valve 1e against seat 12, except When the gaging operation is being performed. l prefer to. face valvev 1t with a packing ring and thereby abrade it. Fig. 2 is a vertical central section on line .the latter chamber.

17, of some suitable material, so as to insure a tight closure between valve 14 and seat 12.

llt the bottom ot' boi: 1 l provide an internally threaded boss 18, arranged vertically beneath opening 1l and formed integral with the base 19 ol box l. To this boss 18 is secured the pipe 2O which communicates With the buried tank, not shown.

At one side of chamber 18 l provide a threaded socket 21 adapted to receive a second plug 22 which seats against a packing Washer 23 on the ledge 2l. rl`liis is :for the purpose-of assembling valveA 14 Vand is, at all other times, kept closed.

ln operation, when it is desired to gage the .depth of liquid in the tank', plug 3 and cap 9 are removed and a graduated rod is inserted y through the vertical opening' that extends coinpietelyth'rough box 1 'and into pipe 20" to the floor or' the tank. This act of inser-` pels valve 14 to follow it until the through opening is again closed at the seat 12. s this rod may be of metal construction, ll prefer to form an upwardlyeiitending lip 9:5 on

the upper surface ot valve 141-, so the rod may not contact with the seatl of valve 1l By the use of valve 14, cap 9 may be omitted and the construction thereby cheapcned; but Ait is preferable to employ both.

means, it for no other reason. than to stimulate that caution onthe part et' the operative which is so essential when handling highly I inflammable material.

l do not limit myself to the precise construction 'shown f ln Fig.` 3, the numeral 30 represents a drain hole through the tloors 8 and 19 for the purpose of carrying od' any liquid which may accumulate in chamber 6. 'lhe Wall 31,l

Within chamber 13,' guards this drain hole and prevents communication between 1t and said box and interposed between said openings, said partition Wall being itself provided with an opening; removable means for closin the Dmrtton Wall onenin' from above' D L L D 7 In aestmony whereo have nmxecl my a valve seat for said partition wall opening signature, in presence of two witncsws.

and below thcrsame; and n, valve, housed Within smid box and adapted to automutically engage said 'seat and 'thus oopemte with said partition wall to provent the rise of gases or fumes through said box,

CHARLES L. THEN (1H.

Vfitiesses z A. T. PALMER, ARTHUR E. Tlmnzn. 

